New self-assembling systems based on bola-type pyrimidinic surfactants

Self-organization of new amphyphilic pyrimidinic compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions and hydrophobic tosylate anions has been studied. New amphiphilic pyrimidinic (AP) compounds with two ammonium head groups and different kinds of coun...

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Bibliographic Details
Published in:Journal of colloid and interface science 2010-02, Vol.342 (1), p.119-127
Main Authors: Zakharova, Lucia, Syakaev, Victor, Voronin, Mikhail, Semenov, Vyacheslav, Valeeva, Farida, Ibragimova, Alsu, Bilalov, Azat, Giniyatullin, Rashit, Latypov, Shamil, Reznik, Vladimir, Konovalov, Alexander
Format: Article
Language:English
Subjects:
Aggregation
Bolaamphiphile
Cetrimonium Compounds - chemistry
Diffusion
Electric Conductivity
Micelles
NMR
Pyridinium Compounds - chemistry
Pyrimidinic
Surface Tension
Surface-Active Agents - chemistry
Surfactant
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Summary:Self-organization of new amphyphilic pyrimidinic compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions and hydrophobic tosylate anions has been studied. New amphiphilic pyrimidinic (AP) compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions (APB) and hydrophobic tosylate anions (APT) were synthesized. Self-organization in these systems has been studied by methods of tensiometry, conductometry, potentiometry and NMR spectroscopy. The critical micelle concentrations (cmc’s) of bola-type surfactants are only a little lower than those of cetyltrimethylammonium (CTA) analogues. For both pairs APB/CTAB and APT/CTAT the counterion binding is stronger for the conventional cationic surfactants as compared to ‘bola’ pyrimidinic surfactants. Unlike the CTAT micelles no sharp micellar growth occurs with the APT concentration. The geometry of AP compounds is assumed to be mainly responsible for the above finding. A branched molecular architecture prevents a close packing of the monomers in the bulk solution and at the interface producing a steric hindrance around the head groups.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2009.10.006